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Brian NolauBrian Nolau 

https://developer.force.com leads me to a "Privacy Error screen" that mentions a248.e.akamai.net

https://developer.force.com leads me to a "Privacy Error screen" that gives me the below message on Google Chrome:

Your connection is not private
Attackers might be trying to steal your information from developer.force.com (for example, passwords, messages, or credit cards). Learn more
NET::ERR_CERT_COMMON_NAME_INVALID
Help improve security on the web for everyone by sending URLs of some pages you visit, limited system information, and some page content to Google. Privacy policy
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This server could not prove that it is developer.force.com; its security certificate is from a248.e.akamai.net. This may be caused by a misconfiguration or an attacker intercepting your connection.
Brian NolauBrian Nolau
is it just because the website is developer.salesforce.com now? pretty confusing stuff
AbhishekAbhishek (Salesforce Developers) 
The problem you're experiencing may be related to the following Knowledge Article on Salesforce certificates changes from Symantec to DigiCert in January and February 2018. Here's a relevant snippet from the last update to the KA:

https://help.salesforce.com/articleView?id=000317640&type=1&mode=1


For further reference check this too,

https://comodosslstore.com/resources/how-to-fix-net-err_cert_date_invalid-error-on-google-chrome/


Let me know if it helps you and close your query by marking it as solved so that it can help others in the future.

Regards,
​​​​​​​Salesforce Support.